Tractor



2 Sheets-Sheet l B. E. cARLsoN .w @VII i.

TRACTOR Apri14, 195o Filedv Sept. 28, 1946 I llll II I mwlll II. TMIWMII m N T T A B. E. CARLSON April 4, 1950- TRACTOR- 2 Sheets-Sheet 2 Y Filed Sept. 28, 1946 N .QI

Patented Apr. 4, 1950 .eltpplieationseptmnhen 28, 1946;"ISerial`No."700;U55

l .1 s 'I'h-cfpresent invention reiat esgenerallyto draft devices :and more vp'arti'cularlytito -`aff"dratloar adapted; tobe vmounted yon a tractor'artiglil ias-"for itsprinoip'a'l object' the pr'ovisionofianadjustable drawbarwliich isilighterfibutwmorereti bending'thanthose *heret'fore known'i Another object is"'toprovide1a/novel folding mechanism for retain'ing"''said drawbar i :ind'fferet'p'ostions, selectively. f

Ano'ther "object is"to^provide'-a idrawhariw?hich isnwll LadaintedLtobe'connected to thefvpowerlilt mechanism Aof -a tracton'fsoras'itd'be-"raisetloand lowered -J'byffth'e poWerfl-ft. l `Still ario'tlfie'r'A objeotcfof the Ppresent'invention is" to-'prcvide-iaf'drawbarof-novl design is aifmte'd" "to leeU connectedFto implements disposed ahead'*ofA "the ftractor or at'the 'side ACif-1" the-'tractor 'forfioperatingf the implements. y 1

*Tn1attaning-these--ltects, thepres'e tion1 contemplates' theuse1o?aiirawsrbari (ifry 'a lpair of= "pressed-'metall iside'- membersaxid a Verse bar and may have a connection, to the upwaidly'fexterding karrrxofthe'bell 'craz'ilkfifior reocated artsafter-@a consideration .of: the ffollowingtfdescrppended:thereto,-y inf which ffl'igure". 1 :is a ipl'anly View of -Ja drawlbars4 embodying thetprincifples'iofithezpresent inventionlshowing'itsvpos'iltion relativeato the irear :portion-Uffa tractor-,ifthe:latter beingfindicatedzby dottedflinest;

FEi'gureL-Z @is-fa planfviewfof the'-drawbarby itseliplportions of itheidrawbarribeing broken awayito disclose lfdetails of iiconstruction;

Figuref-S. isrza :sectional elevationalfviemfitaken substantial-l5" along `the. li-ne' 3-3 of.fEi'gure 2 Yilligur'e 4 is a'fviewfofthed'ace'zof the 'plates' A2 showing the: details 1;thereof,'takenr. substantially alongiithef'lineA-J ofl'ignrel lfan'dfdrawn :to fenlar'ge scale and Figure? 5 lis :an enlarged sectional :elevational view'tak'en 'Jal'ongfailine =r-5`55 in- Figure* .1.

"i Referring inow 'to'Y the drawings, the tractor, denoted 1in @its entiretyby thereferencef-numeral ip'oomprses a'rbodyx :carried at 'zitsrfo'rward-:end onfiaupair of f-rontF/Wheels -n'ot: shown-)Hand fat `:its tears v'end :fon fa :pair "iof rear `traction i-zvvheels 'w1 joum'alledion1aiil-esfdisposed inf the lower sporltion's offranpairof final =dr-ive honsingsu, 9 depending from litheuouters ends of af rear `axle-housing l i0.

' *Iihefwheels@Teareuidriven by 'thetractor "engine 'an'mplement'uthereta z Since the side 'members 2:1;22rareasinrlarinv .oonstrnctiomonly the member 22| x .will be describedY herein.

'i'h-es'sde member 2 lxisform'ed in theshapegof afb'ellf crank" having airearward'lyi extending arm ZInand anupwardly exten'dingiarml, and compr'isesrfa :pressed: metal channel shapedloo'dy .30 hewing,..outwardlyv 'turnediianges 3l :and abackingf'ilateiziwelded to thez'itlanges `3'lto torma hol'lowasstructure.

ing-:sleevesv 33.," 34,;'315i'pass .through ztheixiside memberof2 mandi are' afstenedzt therein- 1byeirieansmyliirli willtbeitdescibedil'ater., LThe bearing.y sleeves@ isidispo'sedmear';thezerid of. the npwardfly extending;armft28zloztheabell cranleandfis .used; :for: connectiomras .by aLl-'bolt 431farida link-'ywithean 44 in the housings 8 by means of nuts 45, and a' pair of engaging mechanisms 50 positioned in the side members 2|, 22 of the drawbar I5, re-

spectively.

Referring now to Figures 1 and 4, the plates 42 are provided with a plurality of openings 46 disposed with their axes lying in arcs of circles.` having their centers at the axis of the pivot bolts 20, respectively. The plates 42 are also provided with slots 41 disposed radially outwardly from the openings 46 in arcs of circles coaxial with the circles previously described.

. The engaging mechanism 50 comprises anl engaging pin I which is adapted to slide axially in a cylindrical bearing sleeve 52 fastened in the backing plate 32 by a method to be described later, the pin 5I extending into the openings 46, selectively, to hold the drawbar I5 in different positions. The pin 5I extends through -a cylindrical bearing sleeve 55 welded to the inner circumference of a supporting ring 56 of U-shaped cross section which is mounted on the metal body 30 by means of suitable conventional fastenings, such as rivets 51, the sleeve 55 being axially aligned with the sleeve 52 to give the eifect of a single bearing sleeve. A spring 60 acts in compression against a collar 6I disposed about the pin 5I and fastened thereto, and reacts against the bearing sleeve 55 to urge the pin 5I to extend beyond the sleeve 52 into engagement with the openings 46, selectively. An annular seat 62`is welded to the outer circumference of the ring 56, the seat 62 having a serrated outer edge providing two sets of bearing surfaces 63, 64 displaced from each other along the axis of the pin 5|. A rod 65 is adapted to pass through an opening 66 in the pin 5I to engage one or'the other of the sets of bearing surfaces 63, 64, thereby holding the pin 5| in either engaged or disengaged position against the'action of the spring. The rod 65 also serves as a handle toaid in positioning the `pin 5 I; In order to fasten the bearing sleeves 33, 34, 35, 52 in the side members 2|, holes are punched in the side members in the proper positions and the bearing sleeves are placed in the allowing the pins 5| to engage different openings. A pair of bolts (not shown) may be 4passed through the bearing sleeves 35 and through the slots 41, and fastened in place by nuts to provide a more rigid connection for holding the drawbar against lateral displacement when necessary, for example, when a laterally vibrating implement suchzas a moweris to bemounted on the bar 23.

A pair of lifting brackets 86 are disposed in a pair of generally vertical bushings'I passing through the rearwardly extending arms 21 of the bell cranks, respectively, the litfing brackets being held in place by a pair of nuts 82 and having 7openings 83 disposedtherein to provide for connecting the drawbar I5 to the power lift mechanism 85 of the tractor by means of chains 86 holes with ends projecting on either side. These ends are then upset to clamp the bearing sleeves in the'side members to hold'the former in-place.'

The operation of the holding device will now be described. To position the drawbar I5, the pin 5I in each Iside member 2| is forced inward against the action of the spring by pulling on the handle rod 65. The .pin is then rotated so that the rod engages the set of bearing surfaces 63. This operation causes the end of the pin 5I to be disengaged from the openings 46. The drawbar is then raised o1' lowered about the axis of the pivot bolts 28 to the 'desired position and the pins 5I are rotated about their axes through `ninety degrees, thus allowing the rod 65 to engage the bearing surfaces' 64. Since the surfaces 64 are located nearer to the side members than the surfaces 63, the spring 6|! operates to force the end of the pin 5I outward through the bearing sleeve 52 and into engagement with one of the openings 46`in the plate 42. Thus the drawbar may be V'held in different positions' by connecting'the brackets 88 with the arms 81 on the rockshaft 88 of the power lift mechanism 85.

In order to raise and lower the drawbar I5 by the power lift mechanism 85, the bolts are removed from the sleeves 35 and the rods 65 are rotated into engagement with the bearing surfaces 63 to hold, the pins 5I out of engagement with the openings v46 and allow the drawbar to move with the rockable arms.

The present drawbar has many uses because it can either be held.. rigidly in place or can bev connected so as to be operated by the power lift rof the tractor. `When it is fastened rigidly in place by the engaging mechanism 50 and by the bolts, the drawbar can be used with a mower adaptedto be mounted directly thereon. When the drawbar is connected to the power lift of the tractor it/can be used to operate cultivators mounted on the drawbar, to raise and lower the cultivators. Connection may be made by means of the hole 33 with implements disposed in front of or to the side of the tractor, for the purpose of controlling the implements. Thus it is evident that the present drawbar provides a very useful type of draft connection for mounting on a tractor.

I claim.

y 1. A drawbar comprising'two side members and pressed metal body and a backing plate rigidly iixed thereto, said side members being hollow, and

said transverse bar extending at each end-thereofthrough and secured to both the body and the backing plate of each side member, respectivelm,l

and being adaptedv for attaching an implement thereto.

. 2,. A drawbar comprising two side members and a transverse bar connecting saidside members, each of said side members being formed inthe shape ofa bell crank, one arm of said bell crank having a portion extending rearwardly to connect withjsaid transverse bar and the other arm having a portion extending upwardly and having means for attachment to an implement, and pivotmeans on each side member intermediate the extending portions of the arms of the bell crankand aligned on an axis paralleling the transverse bar.

3."A' drawbar comprising two side members and a transverse bar connecting said side members, each of said side members having the shape of a bell crank and being composed of a pressed metal body and a backing plate rigidly iixed thereto, said side members being hollow, and said transverse bar extending at each end thereofthrough" and secured to both the-body and the backing plate of each side member, respectively, and being adapted for attaching an implement thereto.

4. A side member for a drawbar, said side member being composed of a pressed metal channel shaped .body and a backing plate rigidly xed thereto to form a hollow structure having opposite walls, and a plurality of bearing sleeves disposed in said side member and passing through openings in a wall of said side member and having upset ends for clamping said bearing sleeves at opposite sides of the wall.

5. A drawbar comprising two side members and a transverse bar connecting said side members, each of said side members being formed in the shape of a bell crank, one arm of said bell crank having a portion extending rearwardly to connect with said transverse bar and the other arm having a portion extending upwardly and having means for being attached to an implement, each of said side members comprising a pressed metal channel shaped body and a backing plate rigidly xed thereto to form a hollow structure, and pivot means on each side member intermediate the extending portions oi the arms of the bell crank and aligned on an axis paralleling the transverse bar.

6. In combination with a tractor having rear axle housings and a pair of nal drive housings depending from the outer ends thereof, a drawbar comprising two side members in the shape of lbell cranks and a transverse bar connecting said side members, each of said side members being composed of a pressed metal body and a backing plate rigidly fixed thereto, said side members being hollow and being pivotally connected to said nal drive housings, respectively, inwardly of the latter to provide for vertical swinging of said drawbar, each of said pivotal connections being positioned in its corresponding side member substantially between the arms of said bell crank.

7. In combination with a tractor having rear axle housings, and a pair of nal drive housings depending from the outer ends thereof, a drawbar having side members pivotally connected to said final drive housings inwardly of the latter to provide for vertical swinging movement, and means for holding said drawbar in diierent positions, said means comprising plates attached to said nal drive housings, respectively, and spring actuated pins disposed in said side members, respectively, said plates having a plurality of openings disposed therein adapted to receive the ends of said pins, said pins being urged into engagement with said openings by means of said springs to hold said drawbar in the desired position.

8. In combination with a tractor having a drawbar pivotally mounted thereon to provide for vertical swinging, means for holding said drawbar in different positions, selectively, said means comprising a plate adapted to be mounted on said tractor and havingopenings disposed therein and an engaging mechanism mounted on said drawbar in position to engage diierent ones of said openings, selectively, said mechanism comprising an engaging pin journaled in said drawbar to provide for axial movement of said pin, one end of said pin being adapted to extend beyond said drawbar to engage said openings, a spring acting against a collar disposed about said pin and against said drawbar to urge said pin into engagement with said openings, a seat mounted on said drawbar and disposed about said pin, said seat having two sets of bearing surfaces displaced one from the other along the axis of said pin, and a rod disposed in an opening passing through the other end of said pin at right angles to the axis of the latter, said rod ybeing adapted to engage either of said bearing surfaces to hold said pin in or out of engagement, selectively, with said openings, said rod also acting as a handle to aid in disengaging said pin from said openings against the action of said spring.

9, The combination set forth in claim 8, with the further provision that said plate has a slot disposed therein in addition to said openings, y

and that a bolt is passed through said drawbar Vadjacent said engaging mechanism and slidably engaging said slot, said bolt being fastenedv in different positions, selectively, in Said slot by means of a nut, in order to hold said drawbar more rigidly in the desired position.

10. The combination set forth in claim 8, with the further provision of means for attaching said drawbar to the power lift of said tractor in order to operate said drawbar by means of said power lift when said pin is held in disengaged position. 1

11. In a tractor having a transverse rear axle structure including laterally spaced portions thereon: a drawbar having laterally spaced side members and means for pivotally connecting said members respectively to said axle portions; and -means for holding the drawbar in diierent angular positions of adjustment about said pivot means, including, for each side member and proximate axle portion, a plate element and a spring-loaded pin element, one element being on the side member and the other on the proximate axle portion, said plates having a plurality of openings disposed therein adapted to receive the ends of said pins, said pins being urged into engagement 'with said openings by means of said springs to hold said drawbar in the desired position.

BERNARD E. CARLSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,802,257 Imhofe et al. Apr. 21, 1931 2,033,813 Broolhiet Mar. 10, 1936 2,321,516 Robertson Jan. 8, 1943 2,341,807 Olmstead et al. Feb. 15, 1944 

